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The Milk and Butterfat Production Responses to Shark Liver Oil in the Ration^*

Departments of Dairy Husbandry and Agricultural Chemistry, University of Idaho, Moscow

ABSTRACT

1. The daily feeding of 60 cc. of shark liver oil furnishing 1,350,000 I.U. of Vitamin A had no effect on milk or butterfat production of either Holstein-Friesian or Jersey cows.
   
2. The daily feeding of 60 cc. of shark liver oil resulted in a 280 to 305 per cent increase in the Vitamin A content of the milk fat.
   
3. The feeding of shark liver oil caused a 22 per cent average decrease in the carotene content of the Holstein milk fat, and a 33 per cent average decrease in the carotene content of the Jersey milk.
   

^* Approved for publication by the Director of the Idaho Agricultural Experiment Station as Research Paper No. 222.